Re: helix location vs focus

Hi Dave,
Right; I used tin foil, but same thing. But the question
I was answering was where to position the helix, with respect
to the maximum-smoke point?
Greg KO6TH
>From: Dave Guimont <dguimon1@san.rr.com>
>To: "Greg D." <ko6th_greg@hotmail.com>
>CC: amsat-bb@amsat.org
>Subject: Re: [amsat-bb] helix location vs focus
>Date: Thu, 06 Jun 2002 23:32:45 -0700
>
>
>
>>> I read somewhere (can't remember) that you should place the
>>> bottom (i.e. feedpoint) of the helix at the focus of the dish.
>>
>>I seem to recall someone on this BB experimenting, and finding
>>that the hot spot was at the end of the first turn for a simple
>>helix. My own experiments seem to put the hot spot at the mouth
>>of the can, for "canned helix" antennas.
>>
>>The best thing to do is to create (or locate) a weak signal
>>source, and adjust it for best signal. Then, let the rest of
>>us know where it is!
>>
>Hi Greg et al,
>
>Very simple to determine, and it is very close to that. I've been winding
>and testing them since O13.
>
>Glue half a dozen ~1" mirrors scattered around the dish. I use them to
>determine
>the mounting length and approximate position for the helix. Tune on a
>steady
>beacon, and adjust for max smoke. Then point back at the sun and
>inter-leave
>a small piece of paper for the bright spot; hot, if u will....
>
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